In the deck panels at the midship section, spacing between longitudinal is 900 mm, and spacing between transverse frames is 4800 mm. If a through-thickness crack of 60 mm is detected in the center of a panel in the transverse direction, is the initial crack size acceptable under its lifetime loading by level 1 FAD assessment?

The plate is 18 mm thick and is made of high tensile strength steel with the following mechanical properties: nominal yield strength is 355 MPa, nominal ultimate strength is 500 MPa, Young’s modulus is 207000 MPa, fracture toughness is

Stillwater bending moment is 0.707 6 ×10 kN-m. The distance from the baseline to the neutral axis of the cross-section is 10772.5 mm, the second moment of the cross-section area is 4.138 e14 mm4.